stuff

Hi folks, I'm the creater of a new podcast wich was recently developed, that primarily runs on Drupal, off of a Linode server here in the U.S since that's where I am, and for those of you thtat wish to check it out it's at
http://www.keithnet.us
Hope you all like it!
However, I'm a totally blind Drupal systems administrator, and that being said, chose Druapl7 alone, over Druapl6, as I do not care about the lack of modules.
From what I understand, Drupal 6 will begin to level off and stop being supported at some point once Drupal8 becomes reality.
So, hear is what I wanted to know.

I installed phpbb3 and phpbb module.

"Forum stuff" block shows 3 links: private messages, unread topics, unread posts. Links to topics and posts work, but "private messages" links to a "forum/inbox" which doesn't exist. But inbox exists, I can use it from the forum.

Why?